Slinky Miss Delphox was the starting point for this one. Keeley Hawes' publicity pic had such a great silhouette that I immediately wanted to include it. I did a poster for Mad Men a couple of years back, using a similar treatment on Joan, and the idea stuck in my head.

The other influence was the heist movie inspiration of the episode itself, which got me thinking about things like Ocean's 11 and the Rat Pack. In my head, this a sorta special Saul Bass-style title sequence for the episode, playing alongside a Henry Mancini sax-and-harpsichord arrangement of the Doctor Who theme.